1. A crew member thinks the main is sheeted in but it is hung on backstay as carefull as they should be about keeping there head clear of the boom they were not and when another crew poped it through without warning

This resulted in a trip to the ER with a fairly serious head injury

2. The crew trying to force it through during a tack or jib loses there footing when it clears and they have nothing left to balance on

Ahh ok Thanks, crew accidents...

I was seeing something diffrent, like the boat broaching and stuff, you know...heeling etc.

I couldn't see that, because the main allways passes, even if stuck momentarily..